My friend has an Otari, 15 ips, 2 track, played me Led Zeppelin, holy crap, now I know what they were doing!!!! Best sound I ever heard. Still remember it, probably will never forget it. He's got lots more now for me to hear.
If you have funds and room, go for it.
I have Teac X2000R (their last prosumer deck) 7-1/2" IPS, 4 track pre-recorded tapes, not like 15 ips 2 track, but still that source beats anything here.
i.e. if limited resources, no need to go 15ips, big expensive tapes to move into 'better than what you have'.
however, as noted, pre-recorded content is limited by their era and end of production.
those pre-recorded tapes, 50, some 60 years old surprisingly still sound amazing, no bleed thru, no stretching, the ends can be brittle, I add new leader tape to both ends, to transfer the startup force to the new leader.
I bought over 500 of them years back, sold 100 of them, only 1 return because it appeared USPS drove a truck over it intentionally.